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Robert,
I will check that the next time I am at
the airport. I am using the stock Renesis wires and igniters. You just
wiggled the wires with the VOM connected??
Bill
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Rob
Sent: Wednesday, January 09, 2013
12:51 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Aeroquip
hose changed to hiccup
Another thing you might check.
I had a similer problem to yours in my fuel injected Ford V6
BD-4 with Tracys EC2 and EM2. For about a year I was plagued, while
flying, with a brief miss with a jerk from the engine at random times
even hours apart. It would mostly happen at higher RPM's then cruise, but
sometimes at cruise. I checked everything I could think of.
My problem was that one or two of my ignition wires (MSD's
8.5mm Super Conductor wire set, brand new no less) had some intermittent
connectors. I discovered this by checking the resistance of each wire while
working the connectors a little bit to see if the resistance fluctuated
excessively or even became an open circuit. Once I fixed these intermittents my
problem was solved.
I know how unsettleing this can be while flying. I hope you
find your problem.
----- Original Message -----
Sent: Wednesday, January
09, 2013 8:38 AM
Subject: [FlyRotary] Re:
Aeroquip hose changed to hiccup
A problem that mimics a poorly wired VR sensor, but
-only happens occasionally,
-with various levels of "response"
Bill, if you haven't done so already, I would suggest changing the
wiring to the VR sensor completely. It sounds to me like a textbook
example of the worst sort of electronic malfunction you can have…an
intermittent open. You'll never find it under normal test conditions, and
it will manifest at the most inopportune times. The only way to
completely rule it out as a failure scenario is to completely replace the
circuit path.
On Jan 8, 2013, at 11:42 PM, Bill Bradburry wrote:
No, I have the 2.85 gearbox. I have
the MT electric prop, so I fly WOT and use the prop to govern the engine
speed.
I have changed the plugs with no
effect. The mixture is fine when this is happening. Fuel pressure
also. I had an incident once on take off like you describe where the
plane was backfiring like crazy just after I lifted off. I had the
mixture too rich. I dialed it back and everything smoothed out.
This is different. It doesn’t really backfire. It is a thump
and it jerks the engine and plane. You can hear and feel it. It
seems to be a single thump and it has varying degrees of violence. Some
are just a little miss and some are so bad it shakes everything. These
are less frequent, but they are bad enough that I don’t think they are
good for the PSRU, prop, or engine mount.
That is why I have been bugging Tracy
about the change for the EC-2. I have my fingers crossed that this will
fix it. :>)
Bill B
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